As is known to us, theory is based on practice and servers practice. A. by chance B. in turn C. in return C. by turn
—Why didn't he attend the meeting yesterday? —__________ he caught a bad cold and now he is in hospital.
Many years ago, he dreamed of becoming the first person __________ both South and North Poles.
The __________ of his aim depends largely on himself.
I was about to go out __________ he came in.
The goods __________ well, so they __________ out quickly.